Seven identical cylindrical chalk sticks fit tightly in a cylindrical container as shown. Container and sticks have equal length. Find occupied-space/empty-space ratio.
Let stick radius be r. The six outer centers are 2r from the center, so container radius is 3r. Total cross-section =9πr², occupied=7πr², empty=2πr². Common length cancels; ratio **7/2, B**.
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